Cutter-holding device for milling-machines.



J. PARKER. CUTTER HOLDING DEVIGB FOBMILLING MACHINES.

' APPLIOA TIOR FILED DBO. 2, 1909.

Patenfied July 12, 1910.

Frauen Cob,

Wi'Ch asses 10 of the invention, such 25 the spindle.

35 the. s indie aonn' PARKER, or rnovrnnlvon,

RHODE ISLAND, ASSIG NOR MFG. (30., F PROVIDENCE, RHODE ISLAND, A CORPORATION ins rarrnivr onion,

TO BIQOWN & SHAH 0F RHODE ISLAND.

GUTTER-HOLIJING DEVICE FOR MILLING-MACHINES.

Specification of Letters Patent. Pai:ent;ed July fi 191% Application filed December 2, 1909. Serial No. 531,046.

and State of Rhode Islanrhhave invented certain new and useful Improvements in Cutter-Holding Devices for Milling-"Vlachines; and I do hereby declare the follow ing to be a full, clear, .and exact description as will enable others skilled in the art to which it appertains to make and use the same. i

The invention relates to cutter securing devices for milling or similar machines, and

\ more particularly to devices adapted to secure large face mills to the spindles of milling machines.

It has heretofore been the usual practice to secure face mills to the spindles of milling machines by screwing 'them'directly on to the nose of the spindle, the direction of the screw thread being such that the resistance offered to the cutter by the work tends to screw the mill more tightly on to In using large mills, the resistance offered by the worlr,,'and the repeated blows upon the mill as the cutting blades come successively into action, fre- -qucntly drive the mill so firmly on to the nose of the spindle that great ditliculty is experienced in removing it. In many cases, after a severe milling operation, it is impracticable to remove the mill without applying suflicient force to strip the thread on or mill, or otherwise injure the mill or spindle. In the case of large face mills, it has also been found desirable to provide the mill with a long hub having a hole extending diametrically through it in frontof the end of the spindle to receive a bar by which sufficient force can be applied =to screw 0d the mill. This brings the. cutter blades beyond" the end of the spindle so that the mill is not supported to the best advantage, and is liable to chatter when making "a heavy cut.

It is the object of the present invention to provide novel and improved devices for-securing face mills or other cutters to the spindles of milling or similar machines which will firmly support the cutter and enable it to be'readily removed without danger of, injury to the cutter or spindle. To this end theinvention contemplates the provision of a split sleeve adapte to engage the screw thread on the nose of the spindle, and

provided with a tapered periphery fitting a corresponding hole, in the center of the cut-- ter or mill. The cutter may be held on the sleeve by any suitable means,.and in the prefer-red embodiment of the invention, is so held by a plate or washer drawn firmly against the outer side of the mill by a bolt passing through the spindle. The mill is thus drawn firmly on to the sleeve, so that the sleeve tightly hugs the spindle, and an effective driving friction between the tapered surfaces on the cutter and sleeve is secured. The tapered portion of the sleeve permits the mill to be readily removed theapplication of little or no force when the binding bolt is loosened, and the split sleeve then opens so. that it may be easily removed from the spindle without danger of injury thereto.

The invention will be readily understood Fig. 2 is a perspective view of the split sleeve for securing the cutter to the nose of the spindle.

As shown in the drawings, the spindle 1 of the milling machine or other similar machine, is provided with the usual screw threaded end or nose 2 for receiving and supporting various tools or cutters. which may be secured to the end of the spindle. The means for securin the large face mill 3 to the end of the spindlecomprises asleeve 4 provided with an interior screw thread 5 for engagin' the screw thread'on the nose of tl'1e"s pind le', and a. tapered periphery 6. The'hub or center of the mill 3 is provided with a tapered bore 7 adapted to fit the tapered periphery of the sleeve. The sleeve is split at 8 so that it will closely hug the end of the spindle when the mill is-drawn on to its tapered periphery, and will open so that it may be readil removed fromthe spindle when the mil is removed. The sleeve may also be providedwith a key 9 for engaging a keyway 10 formed in the bore of the mill, although this key is notessential, since the friction between the sleeve and mill will befound sutlicient to drive the mill even under severe conditions. The mill is drawn firmly to the sleeve by a retaining late or washer 11 adapted to engage the trout end of the mill, and provided with a screw threaded bore for engaging the thread on the end of a bolt 12 which passes through the spindle. In securing the mill to the end of the s pindlc,'tl1c sleeve & is first screwed on to the spindle, and then the mill is laced n position on the sleeve and drawn 1. rmly on to the sleeve by tightening the bolt 12. As the mill is drawn on to the tapered. periphcry of the split sleeve, the sleeve is caused to tightly hug the spindle, so that the mill is firmly and rigidly sup orte'd upon the end of the spindle, and an ettective driving friction is secured between the sleeve and mill.

The resistance offered to the cutting blades of the mill by the work tends to crowd the thread of the sleeve up the threadon the spindle, and thus spread or open the sleeve. This tends to increase the friction between the sleeve and the mill with the increase, in the resistance offered by the work. When the mill is to be removed, the bolt 12 is un- The screwed from the binding plate 11. taper 6 on the sleeve 4 is sufficiently steep to permit the removal of the mill 3 without the application of any considerable force. As soon as the mill is removed the sleeve 4 is released so that it may open and be readily unscrewed from the end of the spindle.

The construction described not only enables large face mills to be readily applied to and removed from the s indie of a milling machine, but also enab es the mill to be supported so that the cutting plane of the blades is close to the end of the spindle,

. with a resulting increase in the rigidity with which the cutters are su ported.

A further advantage oi this construction is that it enables the same mills to be utilized IiIIPOIl ditlerent machines having spindles of di "erent diameters or dillerent pitches of screw threads. By roviding a series of sleeves 4 adapted to lit the spindles of the different machines, the same set of face mills may be used thus avoiding the excessive expense inci out to providing a difie'rent set of mills for each machine. This construction also requires-no change in the spindles, so that the use ofthe mills and access tools already on handand adapted to be screwed upon the nose of the spindle is not interfered with.

While it is preferred to employ the specific construction and arrangement of parts shown and described, itwill be understood that-this construction and arrangement is not essential, except so far as set forth in the claims, and may be varied without departing from the invention.

Having explained the nature and object of the invention, and specifically described one form in which it may be embodied, what I claim is 1. A cutter securing-device comprising a I split sleeve having an interior screw thread for engaging the thread on the nose of a spindle and havinga -tapered periphery to engage a cutter having a correspondingly tapered bore, and means for holding the a screw threaded nose, a split sleevehaving an interior thread for engaging the thread on the nose of the spindle and having a tapered periphery to'engagda cutter having a correspondingly tapered bore,- a retaining plate, and a bolt connected with the late and extending throughthe spindle for rawing the cutter onto the sleeve, substantially as described.

4;. A cutter securing device comprising a split sleeve having an interior screw'thread for engaging the thread on the nose of the spindleand having a tapered surface to engage a correspondin surface within the bore of the cutter, and means for holding the cutter on the sleeve, substantially as described. JOHN PARKER.

Witnesses:

JOHN B. SnDcwIcK, H1, A. W. HAYWARD. 

